This book is the only source we have for a lost history text known as the C
This book is the only source we have for a lost history text known as the Chihrdad. This book contains a dialogue with Bokht-Mara on the issue of ritual purity, and the fifth section of this book is written as a response to a curious man named Yaqub. This text is divided into sections called nasks, and its authorship is traditionally ascribed to somebody named Adurfarnbag. This book does not enjoy the status of scripture, and unlike earlier texts from its religion such as the Fravarane or the Vendidad, it was composed under Islamic rule. Summarizing the Avesta and describing ways to worship Ahura Mazda, for ten points name this official encyclopedia of the Zoroastrian religion. 
This book is the only source we have for a lost history text known as the Chihrdad.
{Denkard}